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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca05f1c2d3a6ea893903a58a407676eb15003b3cbe0a47cbec45aad35aca46f7' 
  AND token = 'GlLIN9yM7BBnL8YijHJVrTri2Atlzn6AW3EUYwqwpWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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