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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68941b785a9b46a7351fdd749b9162b9dcc13867ab88c1ca4a33e6e41580e923' 
  AND token = 'l8qEExPAU3ecXWMI76FxKrnCzyMShJVNxlfgDeU18Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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