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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '249efd47ec1920ed4081272754ac3d96bc4c18952e93db04fef9e3501a8137e0' 
  AND token = '40d2e01Yt5jIUsavJZreeE9ReXCDQVbNSKL41yaqrYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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