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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a640e7e14213c31f606a28e7533f283b7db8f54234f87193e093aaaf669ac58' 
  AND token = 'dp21NIkQ9dR5cYBxhbH5akAS00YRx97KGWkpI99ZajA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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