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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45fe6a5529a4697ed30495d2cd3990266d961129b593509e1db0569bf802b14d' 
  AND token = 'xG87HqKm89gBBx7I0D8JWuHg9DfejZrJclTCTn+ILtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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