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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4007b67398bbc3f02069d4a5e30036b4621b33dca11c06f4cbee54d82d55dd4d' 
  AND token = 'S4qYzA3DM+z4pNSRJ2+grfPAOJA1eHmc/H81U86AP90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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