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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e6be30431fad1bf3f570003b876233ad6916aabe0f60bedf2bab897020b985c' 
  AND token = 'cqYQ2KPEK+F4Rj89IYpeA2AltZ7Kh3qDWFdATFTJLr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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