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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '245c2d4ecb4f8edac3fc332d702c9f4df6fa160677be7898fa85ba77395f37fe' 
  AND token = '4ej+smQwV1B7npZ81y7H0uHAyXDJPAV4/oU3cLVys+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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