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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a25b33992d8f46f7adc06422d022366e89f8029b7133751c613f5d6967cea6' 
  AND token = 'zD6onnR5C+tCLyLB0RsSelyB1VrBDZi15ujcnmVr6EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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