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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b1ba5da5dfaa7ac561a5ba7b000e7394909dd4d5aed5553c593bdcfd717a5f' 
  AND token = 'z+dV4TR+EoeyQcTSTcN1/FXpP3/94BLKJ9xLfqMaGrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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