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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8bac3053a1abe55b1be80b4cda6105df1dd5239cd1d7bc9fc7b0155f0d329b2' 
  AND token = 'I5MmQZueEGLlqnYIGqAPE0C5bB+gT7Vo9REUgCDa4p4=' 
  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"
    }
  }
}