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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26aa2b36fc35bf5b1dc91af101abf942ad099a3f525917b4a1dd312c08abb76f' 
  AND token = 'OuMkFFXo3Fbo2Gin3wfj+VPV9wrUFYs38mnAd7yTUQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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