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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70968a5f1bf7c6857a66ffd3e148df816251bfc8556f19c288a41eafca9d03d8' 
  AND token = '1pmfKLVqMpc0arwKBiUHNTX/Pd4uBTboKI+AsnPJMTo=' 
  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"
    }
  }
}