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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0106d4537e84d6ee5f71c83ce3537749427d4495c2319e2a0dbea0f9375ca7' 
  AND token = 'PyBIQHNncOzzlBxWroDDh033WY6hLEuQ00up1Opxjas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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