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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a378d6d733c5af040b99449b9dcd119759d9f119453b87891a466381e1c817' 
  AND token = 'G+Nv1nNiZKpgL8R/nCCpNf20R/rK0hF1Qc4k/mcsqew=' 
  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"
    }
  }
}