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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88d2149067b3fd10c8bef8f21d7217f009bc1d0920bebb4e57e9803a3dc17fd' 
  AND token = '5nRgBQqhPiPp2DCeHefCozVLmk6tQM1fDfdfm+UtFuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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