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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ecd98f011e7d56abcef2d02dc1ca786b67da7af5b7976a0bc2a2ec27e14216' 
  AND token = 'Bk+9J6a9YicgdGO03ffdUVBi599Zk4UUY17w5z998fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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