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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aea017e2a0b05cfc665fa751d49c5cf4538b618eecdaca06754fd0f449504aa' 
  AND token = 'srfe0otUC3bBeBPHLiAgirokq6MSS2RJL1DArjCUONA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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