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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a20f10dde4a038c05ca1c5d5975a521cec53479a0ff17332060b3dff1132a7' 
  AND token = 'AZY0/CfqZY3frKIixxNGnPzTai5IBuPNt5KS/61A4uM=' 
  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"
    }
  }
}