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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8796fa0c0406c0906d65918811a777bbcc238fa8a40a4fcd75fc15a342c4c2' 
  AND token = 's139V2DH1C2Y25bwpvOy8Bfao0wQZIdWhzxVFtEYP/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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