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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6093a1d6e351c7574a60fb239c08ef1900145602e257b71b2e787ffa1853ff61' 
  AND token = 'hP+06qHL39+XAtOwEC98Uh8NgT9IDkmF4p0hv/h+MJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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