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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f907c5ea2f5615547675b230daa988e230e75cf70d4e658c6935f20d803b9ab' 
  AND token = 'hQoh8NLJ3GOAerPrnfrTIV0PpuXA+tVwCi+p1XQuND0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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