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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d280a3c2aec8ff3608e1f8d6ea2cd28ef5db6394987cd039e6e79ad59d3285' 
  AND token = '1JGvAT6/BPqOsyVFZHMkL2nfRNX8Nq0jMMpWr/5aD7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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