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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30225d78e4dddba90d35274605850a69cafd5669a0e962fff2399b7c09f6b24' 
  AND token = '8bp2kdbJTUoJA4UdbZ6vaRZ/GK19KqQA5cElrj3Grgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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