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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90aa14cbf0441b88679ff1553b17727200ac227f2cca39708c26cf4a2a13163c' 
  AND token = '4kVCT9egbbo4IY+rBSIpybmWCTfvX9urzHW8VMw8NBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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