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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3afd00526dce65b7759c1e7b7e2c73c193a7913b0b67c152ac2e9062ee3efc' 
  AND token = 'uW7+LG/UsOFFBFhQwGkbDJtmaqI8ZZsEieO1MhH7W3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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