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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db9ecf9ed022301ff9211f4af60a6670372ec9d5048dd6f956e4baebfa53682' 
  AND token = 'xV26vIc1DxvCpbpOWZ1kpgmookDiqUf88U3vU57233w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}