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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e51aeca93f29a787d779f2a051c6c22c69841d6212f6bc9ce7a770b98c51d1e7' 
  AND token = 'mkNoW+85mwIkI19ORZJajI7WT6oFKsRq3S2UphSJLos=' 
  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"
    }
  }
}